In this post, I am sharing the different options to check weather your table exists in your database or not.

For checking the existence of table is a ubiquitous requirement for PostgreSQL Database Developer.
PostgreSQL 9.4 introduced to_regclass to check object presence very efficiently.

You can check other below options as well.

Use to_regclass (From PostgreSQL 9.4): This is the fastest option.

SELECT to_regclass('schema_name.table_name');

Use information_schema.tables:

SELECT EXISTS 
(
	SELECT 1
	FROM information_schema.tables 
	WHERE table_schema = 'schema_name'
	AND table_name = 'table_name'
);

Use catalogs tables:

SELECT EXISTS 
(
	SELECT 1 
	FROM pg_catalog.pg_class c
	JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
	WHERE n.nspname = 'schema_name'
	AND c.relname = 'table_name'
	AND c.relkind = 'r' -- r = tables 
);

Use pg_tables catalog:

SELECT EXISTS 
(
	SELECT 1 
	FROM pg_tables
	WHERE schemaname = 'schema_name'
	AND tablename = 'table_name'
);